Hey Doc thanks for the input I've read several of your post ,enough to know you know a lot more than me.What gets me is out of four bone stock cvo 110 bikes two 09 and two 2010's all have have the exact same mods TTS,2" baffles open head pipes(X pipe,V&H Pwr Duels)the 2010's never kick back when starting but the 09 SERG'S make a horrible clank most every time.I was told by a HD Tech at our local dealer that the noise is coming from the front compensator sprocket over running the primary when the engine fires and spins faster than the starter is turning the ring gear.Does this sound right and is the compensator sprocket different on a 2009 than a 2010?I really fear another ring gear/clutch basket failure next month on our trip to Sturgis and that could really be a bad deal as far as we have to go and as many times as you have to grit your teeth when you push that little button.The last time it failed the starter completly lock up on the broken ring gear tooth and had to be trailered. Help,Thanks Mike